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https://issues.apache.org/jira/browse/HADOOP-2395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HADOOP-2395 started by Bryan Duxbury.

> [hbase] Implement "ALTER TABLE ... CHANGE column" operation
> -----------------------------------------------------------
>
>                 Key: HADOOP-2395
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2395
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/hbase
>            Reporter: Bryan Duxbury
>            Assignee: Bryan Duxbury
>
> Right now, you can add or delete column families, but not change them once 
> they are created. This is really inconvenient for things like adding 
> compression or bloom filters to a column family once you get going. As new 
> people come to HBase, they're going to make schema decisions that are 
> incorrect and will need a way to modify their tables, so this is an important 
> new feature.

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